Selenium GRID——调用 WebDriver.getCurrentUrl() 时， session 由于 TIMEOUT 在不到 100 毫秒后终止

Question

我有一组并行测试，当我在本地运行它们时从未出现此问题。这种情况只发生在我的小两个节点网格上。当我尝试调用 WebDriver.getCurrentUrl() 时，我的测试总是失败。错误信息是这样的:

org.openqa.selenium.WebDriverException: Session [035e8f79-fdd7-4492-a565-f803df792d3c] was terminated due to TIMEOUT
Command duration or timeout: 90 milliseconds
Build info: version: '2.53.0', revision: '35ae25b1534ae328c771e0856c93e187490ca824', time: '2016-03-15 10:43:46'
System info: host: 'bos-mpky6', ip: '172.30.31.59', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.11.6', java.version: '1.8.0_102'
Driver info: org.openqa.selenium.remote.RemoteWebDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=46.0.1, platform=LINUX, nativeEvents=false, acceptSslCerts=true, webdriver.remote.sessionid=035e8f79-fdd7-4492-a565-f803df792d3c, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: 035e8f79-fdd7-4492-a565-f803df792d3c

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:678)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:701)
    at org.openqa.selenium.remote.RemoteWebDriver.getCurrentUrl(RemoteWebDriver.java:326)

起初，我认为这是一个配置问题，但我已将我的设置配置为超时时间远长于几毫秒。这是我用于集线器的配置:

{
  "host": null,
  "port": 4444,
  "newSessionWaitTimeout": -1,
  "servlets" : [],
  "prioritizer": null,
  "capabilityMatcher": "org.openqa.grid.internal.utils.DefaultCapabilityMatcher",
  "throwOnCapabilityNotPresent": true,
  "nodePolling": 5000,
  "cleanUpCycle": 5000,
  "timeout": 300000,
  "browserTimeout": 0,
  "jettyMaxThreads":-1
}

这是我为两个节点使用的配置:

{
   "capabilities":
   [
      {
         "browserName": "firefox",
         "version": "46.0.1",
         "platform": "LINUX",
         "maxInstances": 5
      }
   ],
   "configuration":
   {
       "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
       "nodeTimeout":500000,
       "port":5555,
       "nodePolling":2000,
       "registerCycle":10000,
       "register":true,
       "cleanUpCycle":2000,
       "timeout":500000
   }
}

我没有使用 Docker 或类似的东西。我已经尝试过 2.53.1、2.53.0、2.52.0 和 2.51.0 版本的网格服务器，但问题仍然困扰着我的测试。我可以做些什么来摆脱这个问题吗？我找不到与超时相关的配置设置，似乎可以摆脱这个问题。

Answer 1

当我调整timeout和browserTimeout属性时，我遇到了同样的错误。我的解决方案是将集线器配置设置回默认值。但你已经和我现在一样了。

但是我发现您的节点配置略有不同。我使用Windows 7作为节点，这是我的配置:

{
  "capabilities": [
    {
      "browserName": "firefox",
      "maxInstances": 2,
      "takesScreenshot": true,
      "seleniumProtocol": "WebDriver"
    },
    {
      "browserName": "internet explorer",
      "maxInstances": 1,
      "version": "11",
      "webdriver.ie.driver": "<MOUNT>\Selenium\IEDriverServer_2.53.1_32bit",
      "takesScreenshot": true,
      "platform": "WINDOWS",
      "seleniumProtocol": "WebDriver"
    }
  ],
  "configuration": {
    "_comment" : "Configuration for Node",
    "cleanUpCycle":5000,
    "timeout": 500,
    "port": 8088,
    "hubHost": V0001172,
    "register": true,
    "hubPort": 8089,
    "maxSession": 1
  }
}

我将 seleniumProtocol 添加到我的节点配置中。我不记得在哪里找到它，但在我的设置中它可以工作。